Making TPMS or voronoi infill for a specific portion of a solid body

I have 60 m length beam. But I want the beam to be infilled by gyroid lattice through first 50 m length and the remaining 10 m to be fully solid. How can I do that? I want to 3D print the structure.

If you upload your beam or share how you’re currently making the gyroid lattice, it’ll be easier to help. If you’re not using a gyroid yet, this post could be a good starting point:

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I cannot thank you enough. This is exactly what I’m willing to do. Thanks again! Best wishes…

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Do you have a video file for this example? I’m new to Rhino and Grasshopper. It would be better if I can see how the algorithm works, step by step.